The 1972 track, believed to be called ‘Fragile’, has reportedly never been heard in public before.

It was found on a tape owned by a Rolling Stones collector named Matt Lee and is said to feature Jagger and Simon singing a slow ballad. The Associated Press reports Jagger contributes the most singing, while Simon adds some harmonies.

In an interview published on Rolling Stone in 2016, Simon said: “We had this little back and forth at the piano for about an hour.” She also said the recording had been lost for decades and sang a line from the song, which went: “Funny, funny, funny, funny, funny/How love can make you cry.“

The report notes that the recording found by Lee matches those lyrics, apart from when the pair appear to sing “change” instead of “cry”.

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Lee has not said where the tape came from but did reveal he had sent a digital copy of the song to Rolling Stone because they had promised to pass it on to Simon. “I’m not doing it for the money,” he said. “I’m a collector. My motive for sending it to Rolling Stone was to pass it to Carly.”

Meanwhile, earlier this year, Jagger said he was working on new Rolling Stones music. “I don’t really think about what I have written, much. I just keep ploughing forward, really,” he said.

He has also discussed his lack of retirement plans, saying he wasn’t thinking about quitting performing just yet. “There is going to come a point when we don’t want to do it anymore, for whatever reason,” he explained. “But I’m not thinking about that this summer.”